Email Subject Lines and Preview Text That Get Opened
Ranked subject line and preview text pairs from your email's strongest detail, with truncation and honesty checks and an A/B test plan.
Before & after
Same prompt, same agent — the only difference is the skill.
Subject lines are crucial for email open rates. A good subject line should be curiosity-provoking without being misleading, and it should hint at the value inside. You might want to test different approaches - some newsletters use numbers, some use questions, some use urgency. The best strategy is usually to test several variations with your audience. What's your newsletter about? Knowing your niche and audience would help me suggest some subject line ideas that would resonate with them.
SUBJECT LINE RANKING (ESTIMATED OPEN RATES) TIER 1: QUESTION FORMAT (35-42% open rate) 1. How I went from 1k to 50k subscribers in 12 months 2. Why most creators quit before seeing results 3. What happened when I raised my rates by 40% TIER 2: NUMBER-BASED (32-38% open rate) 1. 7 email templates that get 45% open rates 2. 3 hidden metrics nobody talks about 3. 5 reasons SaaS founders miss their targets TIER 3: BENEFIT-FORWARD (28-34% open rate) 1. Save 10 hours this week with this workflow 2. Get your first 100 affiliate referrals 3. Avoid the pricing mistake that killed 6 startups TIER 4: CURIOSITY/PATTERN-BREAK (26-32% open rate) 1. This revenue number confused me 2. Not what I expected 3. Plot twist inside AVOID (5-12% open rate) • Generic: Newsletter #427, Weekly update • Overhyped: SHOCKING revelation, URGENT action • Mismatch: Subject line doesn't match email content TEST STRUCTURE → Group 1: Question (What if X?) → Group 2: Number (X reasons, X tips) → Group 3: Benefit (Save X, Avoid X) → Track which group your audience responds to most
About this skill
Your issue is good, but the subject line reads like every other email in the inbox. Or your open rates dropped, and you can't tell whether the wording, your deliverability, or the reporting is to blame. This skill writes subject lines from the most specific detail in your email. It pairs each one with preview text that adds something new and checks that every line survives mobile truncation and is honest about what's inside.
What it does
- Pulls the concrete numbers, outcomes, and assets out of your draft and turns them into 5-7 subject lines that each take a different angle (not 10 rewordings of one idea)
- Treats sender name, subject, and preview text as one inbox row, so the preview adds a second fact instead of repeating the subject
- Counts characters and puts the important words first so the line still makes sense when a phone cuts it off
- Cuts clickbait, fake "Re:" lines, made-up urgency, and merge tags that have no fallback, and tells you why each one fails
- Sets up an A/B test where the two lines differ in one way, picks a metric that inflated opens can't skew, and estimates how big a gap is just noise for your list size
- Works out why open rates dropped (inflated reporting, deliverability, or the wording) before rewriting anything
What you get
A top pick with preview text and a one-line reason, a ranked table of alternatives with character counts and angles, an A/B pair with what the result would tell you, and the lines that got cut with the reason for each.
Best for
Newsletter writers, creators sending launch or promo emails, and solo operators whose list is growing and whose subject lines have started to sound the same.
SKILL.md preview
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name: email-subject-lines-preview-text
description: Writes, ranks, and fixes email subject lines paired with preview text. Each line comes from the email's most specific detail and is checked for mobile truncation, honesty about the content, and fit with the sender name. Includes an A/B pair that tests one idea and a noise check sized to the list. Use when the user says "write a subject line for this issue", "give me subject lines to A/B test", "my open rates keep dropping", "is this subject line clickbait", "what should my preview text say", "rank these subject lines", "my subject lines all sound the same", or "subject line for my launch email".
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